Title :
A tunable, video-frequency, low-power, single-amplifier biquadratic filter in CMOS
Author :
Schmid, Hanspeter ; Moschytz, George S.
Author_Institution :
Inst. for Signal & Inf. Process., Swiss Federal Inst. of Technol., Zurich, Switzerland
Abstract :
In this paper, a tunable single-amplifier biquadratic lowpass filter is presented. It consists of one balanced low-gain current amplifier and a second-order MOSFET-C feedback network. The filter was integrated in a double-poly 0.6 μm CMOS process and operates from a 3.3 V power supply. The pole frequency is tunable from 15.2 to 17.2 MHz, the pole Q is 3, the spurious-free dynamic range is at least 60 dB, and the filter consumes only 2.4 mW per pole. Furthermore, the active area used per pole is only 0.06 mm2. The filter is well suited for low-power video-frequency applications, and demonstrates that the MOSFET-C filter technique can be applied successfully to filters other than those based on integrator-connected topologies
Keywords :
CMOS analogue integrated circuits; biquadratic filters; circuit feedback; circuit tuning; low-pass filters; low-power electronics; operational amplifiers; radiofrequency filters; 0.6 micron; 15.2 to 17.2 MHz; 3.3 V; MOSFET-C filter technique; active filter; balanced low-gain current amplifier; double-poly CMOS process; low-power filter; lowpass filter; second-order MOSFET-C feedback network; single-amplifier biquadratic filter; tunable monolithic filter; tunable pole frequency; video-frequency filter; Active filters; Band pass filters; CMOS process; Energy consumption; Feedback; Frequency; Harmonic distortion; MOSFET circuits; Power filters; Tunable circuits and devices;
Conference_Titel :
Circuits and Systems, 1999. ISCAS '99. Proceedings of the 1999 IEEE International Symposium on
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-5471-0
DOI :
10.1109/ISCAS.1999.780635
